Deep in Latvia’s forests, NATO troops recently squared off against a new kind of threat — one that doesn’t eat, sleep or care about the weather.

The exercise, called Crystal Arrow, thrust soldiers into simulated combat against unmanned ground vehicles, or UGVs, as the alliance races to catch up with the rapidly evolving world of drone warfare already reshaping battlefields in Ukraine.

Latvian troops leading the exercise admitted they were playing catch-up. Lt. Col. Andris Brūveris, commanding Latvia’s 2nd Mechanized Infantry Battalion, reflected this reality when he briefed reporters this week.

“They are force multipliers, and they are here to stay,” he said, acknowledging that NATO had been focused mostly on aerial drones until now. “I hope we will move forward with this at a quick pace.”

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With Russia watching from just across the border, NATO’s war planners used the drills to test how ground robots could be integrated alongside traditional troops and air-based reconnaissance.

The exercise unfolded less than 200 kilometers from Russian territory — no coincidence given the alliance’s growing emphasis on bolstering its eastern defense line.

The red team, commanded by Brūveris, was given an arsenal of Estonian-made Ark-1 UGVs that can handle reconnaissance or deliver a lethal payload like a rolling antitank mine.

Moving faster than most military vehicles and able to navigate rough woodland, the small four-wheeled robot proved to be a game changer, offering eyes and teeth on the forest floor.

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“These systems are changing the way we train,” said Brig. Gen. Chris Gent, the alliance’s deputy chief of staff for transformation and integration at Allied Land Command.

He explained that the robotic assets were introduced specifically so NATO’s “blue force” could learn firsthand how to counter them — forcing commanders to rethink battlefield tactics in real time.

Ukraine’s influence loomed large over the exercise. Veterans from Kyiv’s battle-hardened drone units helped train the NATO troops and demonstrated tactics that have confounded Russia for over two years.

The Ukrainians showed how ground drones could scout enemy defenses, deliver supplies, and even carry out targeted strikes — all without risking a single soldier.

One Ukrainian trainer, known by the callsign Sleb, pointed out that for troops under fire, unmanned vehicles offer a priceless advantage.

“It’s better to lose a robot than a soldier,” he said matter-of-factly. That blunt truth has driven Ukraine’s rapid push to scale up production, with Kyiv announcing a purchase of 25,000 UGVs by the end of June.

Initially, some NATO soldiers weren’t impressed. The Ark-1 looked more like a hobbyist’s remote-controlled car than a weapon of war. But after seeing it in action, skepticism turned into respect. “On the first day, they’re laughing, they’re joking that it’s just a toy,” said a Ukrainian operator nicknamed Backspace.

“But yesterday on the operation, they were shocked. We are doing war like in a movie, because it’s really very powerful.”

The robots’ flexibility became even more evident as conditions worsened. When wind speeds made aerial drones too unstable to fly, Brūveris’ unit relied entirely on their ground drones to slip through enemy lines for intelligence gathering and quick strikes.

Not only did it prove the platform’s resilience, it gave NATO planners more to chew on in terms of integrating unmanned systems across all levels of command.

The learning curve wasn’t only technical — it was doctrinal. “Now we need to figure out how to fit UGVs into our military decision-making,” Brūveris admitted.

“The blue force hadn’t faced these drones before, and neither had I. We’re both learning.” NATO’s Allied Land Command wants that kind of grassroots experimentation from the field, blending soldier ingenuity with modern technology instead of dictating top-down blueprints from Brussels.

Gen. Chris Donahue, head of U.S. Army Europe and Africa, visited the exercise to observe how these robotic systems fit into NATO’s broader Eastern Flank Deterrence Initiative.

The key question, said Canadian reserve officer Sean Thorne, is whether UGVs can deliver “a real tactical advantage.”

So far, the answer appears to be yes — especially considering speed, size, and the ability to take the place of human lives on the front line.

Ground robots, of course, aren’t without challenges. Dense forests in Latvia caused communication dropouts with the Starlink-linked systems. Terrain mapping and signal planning became critical to mission success.

Unlike wind-dependent aerial drones, these ground bots rely on steady network links — a reminder that hardware innovation must be matched by smart planning and training.

For Brūveris and his troops, it’s clear the robots aren’t science fiction anymore.

“These unmanned systems are the future,” he said after the exercise. “Because one way or another, it’s cheaper than people’s lives.” That single sentence captured the entire spirit of modern warfare — technology filling the gap where manpower runs thin.

If NATO wants to keep pace with America’s next-gen military innovations under President Trump’s revitalized war doctrine and Secretary of War Pete Hegseth’s combat-centered modernization push, then lessons from Latvia’s forests will be crucial.

Because from the Baltic border to the Black Sea, the robots are coming — and they’re not waiting for bureaucrats to catch up.

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